Cryptic crossword clue
Dissolute editor stopped indulging completely 6

The most common and most likely answer to this crossword clue is the 6 letter word FASTED

I've seen this crossword clue in The Daily Telegraph
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The straight part
We know that "stopped indulging completely" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case stopped indulging completely = fasted.
The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.
This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.

What does FASTED mean?

FASTED verb
  1. To restrict one’s personal consumption, generally of food, but sometimes other things, in various manners (totally, temporally, by avoiding particular items), often for religious or medical reasons.

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